.clearfix:after {
  content: "";
  display: block;
  clear: both;
}
.table-center {
  display: table;
  line-height: normal;
  height: 100%;
  &>* {
    display: table-cell;
    vertical-align: middle;
  }
}
.middle {
  &> * {
    vertical-align: middle;
  }
}
